Air turbine handpiece



FIG. 1 is a side elevational view of a dental drill handpiece embodying my new design;

FIG. 2 is a top plan thereof;

FIG. 3 is an end view looking from the left of FIG. 1;

FIG. 4 is an end view looking from the right of FIG. 1; and

FIG. 5 is a bottom plan view. 

The ornamental design for an air turbine handpiece, as shown. 